A gamma camera's observed count rate is 80,000 cps when the true count rate is 100,000 cps. What is the system dead time (τ) assuming a paralyzable model is NOT applicable and using the non-paralyzable formula n = m/(1 − mτ)?

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Multiple choice — select the best answer

A1.0 µs
B2.5 µs
C4.0 µs
D5.0 µs

✓ Correct answer: B. 2.5 µs Non-paralyzable: n = m / (1 − mτ), so τ = (1 − m/n) / m = (1 − 80000/100000) / 80000 = 0.20 / 80000 = 2.5 × 10⁻⁶ s = 2.5 µs.

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Topic: Instrumentation

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A gamma camera's observed count rate is 80,000 cps when the true count rate is 100,000 cps. What is the system dead time (τ) assuming a paralyzable model is NOT applicable and using the non-paralyzable formula n = m/(1 − mτ)?

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